student.css

#self-view {
    height: 180px;
    border-radius: 5%;
    overflow: hidden;
    position: relative;
}
#self-view .badge {
    bottom: 0;
    left: 0;
    position: absolute;
    z-index: 2;
    display: none;
}
.camera-view {
    border-radius: 10px;
    overflow: hidden;
}
#streams {
    height: 85vh;
    max-height: 90vh;
    position: relative;
}
.stream {
    transition: top, left 0.5s ease-in;
    width: 0;
    height: 0;
    position: relative;
    z-index: 1;
    display: none;
}
.stream.has-stream {
    display: block;
}

/* Teacher cam only */
.hasTeacherCamera #teacher-camera {
    height: 100%;
    width: 100%;
}

/* Teacher screen only */
.hasTeacherScreen #teacher-screen {
    width: 100%;
    height: 100%;
    border-radius: 5px;
    overflow: hidden;
}

/* Guest student only */
.hasStudent #student-stage {
    width: 100%;
    height: 100%;
}

/* Teacher cam + screen */
.hasTeacherCamera.hasTeacherScreen #teacher-camera {
    position: absolute;
    bottom: 10px;
    right: 20px;
    width: 200px;
    height: 150px;
    z-index: 2;
}
.hasTeacherCamera.hasTeacherScreen #teacher-screen {
    width: 100%;
    height: 100%;
}

/* Guest student + Teacher cam */
.hasTeacherCamera.hasStudent #teacher-camera,
.hasTeacherCamera.hasStudent #student-stage {
    width: 50%;
    height: 360px;
    margin: 0;
    padding: 0;
    float: left;
}
.hasTeacherCamera.hasStudent #teacher-camera {
    border-radius: 10px 0 0 10px;
}
.hasTeacherCamera.hasStudent #student-stage {
    border-radius: 0 10px 10px 0;
}

/* Guest student + Teacher cam + Teacher screen */
.hasTeacherCamera.hasTeacherScreen.hasStudent #teacher-camera {
    position: absolute;
    bottom: 10px;
    right: 20px;
    width: 200px;
    height: 150px;
    z-index: 2;
    border-radius: 5px;
    overflow: hidden;
}
.hasTeacherCamera.hasTeacherScreen.hasStudent #student-stage {
    position: absolute;
    bottom: 10px;
    left: 20px;
    width: 200px;
    height: 150px;
    z-index: 2;
    border-radius: 5px;
    overflow: hidden;
}
.hasTeacherCamera.hasTeacherScreen.hasStudent #teacher-screen {
    width: 100%;
    height: 100%;
    display: block;
    float: none;
    clear: both;
    margin: 0 auto;
    border-radius: 5px;
    overflow: hidden;
    z-index: 1;
}